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/*
* The MORUS-640 Authenticated-Encryption Algorithm
* Common x86 SIMD glue skeleton
*
* Copyright (c) 2016-2018 Ondrej Mosnacek <omosnacek@gmail.com>
* Copyright (C) 2017-2018 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*/
#include <crypto/internal/aead.h>
#include <crypto/internal/skcipher.h>
#include <crypto/morus640_glue.h>
#include <crypto/scatterwalk.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <asm/fpu/api.h>
struct morus640_state {
struct morus640_block s[MORUS_STATE_BLOCKS];
};
struct morus640_ops {
int (*skcipher_walk_init)(struct skcipher_walk *walk,
struct aead_request *req, bool atomic);
void (*crypt_blocks)(void *state, const void *src, void *dst,
unsigned int length);
void (*crypt_tail)(void *state, const void *src, void *dst,
unsigned int length);
};
static void crypto_morus640_glue_process_ad(
struct morus640_state *state,
const struct morus640_glue_ops *ops,
struct scatterlist *sg_src, unsigned int assoclen)
{
struct scatter_walk walk;
struct morus640_block buf;
unsigned int pos = 0;
scatterwalk_start(&walk, sg_src);
while (assoclen != 0) {
unsigned int size = scatterwalk_clamp(&walk, assoclen);
unsigned int left = size;
void *mapped = scatterwalk_map(&walk);
const u8 *src = (const u8 *)mapped;
if (pos + size >= MORUS640_BLOCK_SIZE) {
if (pos > 0) {
unsigned int fill = MORUS640_BLOCK_SIZE - pos;
memcpy(buf.bytes + pos, src, fill);
ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
pos = 0;
left -= fill;
src += fill;
}
ops->ad(state, src, left);
src += left & ~(MORUS640_BLOCK_SIZE - 1);
left &= MORUS640_BLOCK_SIZE - 1;
}
memcpy(buf.bytes + pos, src, left);
pos += left;
assoclen -= size;
scatterwalk_unmap(mapped);
scatterwalk_advance(&walk, size);
scatterwalk_done(&walk, 0, assoclen);
}
if (pos > 0) {
memset(buf.bytes + pos, 0, MORUS640_BLOCK_SIZE - pos);
ops->ad(state, buf.bytes, MORUS640_BLOCK_SIZE);
}
}
static void crypto_morus640_glue_process_crypt(struct morus640_state *state,
struct morus640_ops ops,
struct skcipher_walk *walk)
{
while (walk->nbytes >= MORUS640_BLOCK_SIZE) {
ops.crypt_blocks(state, walk->src.virt.addr,
walk->dst.virt.addr,
round_down(walk->nbytes, MORUS640_BLOCK_SIZE));
skcipher_walk_done(walk, walk->nbytes % MORUS640_BLOCK_SIZE);
}
if (walk->nbytes) {
ops.crypt_tail(state, walk->src.virt.addr, walk->dst.virt.addr,
walk->nbytes);
skcipher_walk_done(walk, 0);
}
}
int crypto_morus640_glue_setkey(struct crypto_aead *aead, const u8 *key,
unsigned int keylen)
{
struct morus640_ctx *ctx = crypto_aead_ctx(aead);
if (keylen != MORUS640_BLOCK_SIZE) {
crypto_aead_set_flags(aead, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
memcpy(ctx->key.bytes, key, MORUS640_BLOCK_SIZE);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_morus640_glue_setkey);
int crypto_morus640_glue_setauthsize(struct crypto_aead *tfm,
unsigned int authsize)
{
return (authsize <= MORUS_MAX_AUTH_SIZE) ? 0 : -EINVAL;
}
EXPORT_SYMBOL_GPL(crypto_morus640_glue_setauthsize);
static void crypto_morus640_glue_crypt(struct aead_request *req,
struct morus640_ops ops,
unsigned int cryptlen,
struct morus640_block *tag_xor)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
struct morus640_state state;
struct skcipher_walk walk;
ops.skcipher_walk_init(&walk, req, true);
kernel_fpu_begin();
ctx->ops->init(&state, &ctx->key, req->iv);
crypto_morus640_glue_process_ad(&state, ctx->ops, req->src, req->assoclen);
crypto_morus640_glue_process_crypt(&state, ops, &walk);
ctx->ops->final(&state, tag_xor, req->assoclen, cryptlen);
kernel_fpu_end();
}
int crypto_morus640_glue_encrypt(struct aead_request *req)
{
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
struct morus640_ops OPS = {
.skcipher_walk_init = skcipher_walk_aead_encrypt,
.crypt_blocks = ctx->ops->enc,
.crypt_tail = ctx->ops->enc_tail,
};
struct morus640_block tag = {};
unsigned int authsize = crypto_aead_authsize(tfm);
unsigned int cryptlen = req->cryptlen;
crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
scatterwalk_map_and_copy(tag.bytes, req->dst,
req->assoclen + cryptlen, authsize, 1);
return 0;
}
EXPORT_SYMBOL_GPL(crypto_morus640_glue_encrypt);
int crypto_morus640_glue_decrypt(struct aead_request *req)
{
static const u8 zeros[MORUS640_BLOCK_SIZE] = {};
struct crypto_aead *tfm = crypto_aead_reqtfm(req);
struct morus640_ctx *ctx = crypto_aead_ctx(tfm);
struct morus640_ops OPS = {
.skcipher_walk_init = skcipher_walk_aead_decrypt,
.crypt_blocks = ctx->ops->dec,
.crypt_tail = ctx->ops->dec_tail,
};
struct morus640_block tag;
unsigned int authsize = crypto_aead_authsize(tfm);
unsigned int cryptlen = req->cryptlen - authsize;
scatterwalk_map_and_copy(tag.bytes, req->src,
req->assoclen + cryptlen, authsize, 0);
crypto_morus640_glue_crypt(req, OPS, cryptlen, &tag);
return crypto_memneq(tag.bytes, zeros, authsize) ? -EBADMSG : 0;
}
EXPORT_SYMBOL_GPL(crypto_morus640_glue_decrypt);
void crypto_morus640_glue_init_ops(struct crypto_aead *aead,
const struct morus640_glue_ops *ops)
{
struct morus640_ctx *ctx = crypto_aead_ctx(aead);
ctx->ops = ops;
}
EXPORT_SYMBOL_GPL(crypto_morus640_glue_init_ops);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Ondrej Mosnacek <omosnacek@gmail.com>");
MODULE_DESCRIPTION("MORUS-640 AEAD mode -- glue for x86 optimizations");
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